standard specification for erection tender - GAIL

Gas Gr. IIA & IIB Temp T3. All analyzer components located in hazardous areas must
meet the electrical classification of that area.
6.1.13 Analyzer shall be selected for high accuracy and repeatability as the primary criteria.
Analysis speed and cycle time is secondary for custody transfer purposes.
6.1.14 Analyzer and sample system shall be suitable for outdoor installation in the field.
Minimum of IP66 protection shall be provided.
6.1.15 A sunshade and a three-side weather shelter shall be provided to protect the Analyzer
and sample system.
6.1.16 Power supply for the gas chromatograph system shall be 24 VDC / 230 Volts ac from
the purchasers electrical supply system. VENDOR shall provide the power requirements
of the system.
6.2 SAMPLE SYSTEM
6.2.1 Vendor shall provide a fabricated assembly of sample conditioning system having facility to
measure sample flow to the chromatograph proper.
6.2.2 Sampling system design should be such that the sample drawn for analysis is truly
representative of the process stream. The unit shall be supplied with all equipment necessary to
condition each stream for injection into the chromatograph. The system must include, but not
limited to, all Regulators, vaporizers, dryers, filters, rotameter, solenoid valves required for
proper analysis. All Components of sampling system shall be rated for the mechanical design
pressure and temperature conditions indicated in purchaser's data sheet.
6.2.3 Transportation time for the sample from the process tapping point upto the sampling system
shall not exceed 30% of the cycle time specified for the chromatograph.
6.2.4 The sampling system shall contain at least one wire mesh strainer of US standard sieve mesh
size 100 or finer. Where purchaser's data sheets indicate greater possibilities of plugging,
vendor shall provide more filters/separators as required.
6.2.5 Where purchaser's data sheets indicate possibilities of polymer formation on presence of excess
polymers, vendor shall offer suitable design features to minimize plugging because of polymer
residue.
6.2.6 Wherever the process stream pressure is low, vendor shall provide/ advise the purchaser on
use of aspirators or sample pumps. Vendor shall also indicate the utility requirements (e.g water
or air) for such devices.
6.2.7 Sampling system shall include provisions for connection of calibration standard.
6.2.8 Sampling system shall include block valves on all process sampling lines.
GAIL (INDIA) LTD
NEW DELHI
STANDARD SPECIFICATION
FOR
GAS CHROMATOGRAPH
SPECIFICATION
S-08-02-025
REV-0
Page 9 of 17
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